Python regex finditer or findall do not find all the substrings

Question

I would like to find all the occurrences of sub-strings in a text.

This works:

 import re
 [m.start() for m in re.finditer('te.t', 'text test taste test')]

it returns [0, 5, 13]

But these return only one match while I know there are more:

  text = 'AAGCCAGATGAATGTTTTTTTTTTtcagggaagaagaaAAAAAACCAAACAAAAATAATGATCCTGACG'
  [m.start() for m in re.finditer('TTTTTT..............AAAAAA', text.upper())]
  # or even this one
  [m.start() for m in re.finditer('TTTTTT', text.upper())]

Is this a flaw in the algorithm? It seems that it doesn't understand that a longer stretch of 'TTTTTTTTTT' involves many 'TTTTTT' matches.

Am I missing something?